Array of Piezo-Electric Patches (IMAGE) Advanced Science Research Center, GC/CUNY Caption An array of piezo-electric patches modulated in time to realize a topological insulator for sound with nonreciprocal features. Credit Amir Ardabi Usage Restrictions This graphic may only be used in conjunction with coverage of this research License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.